First congratulations for this great mod, best Midle Earth one IMO.
I have a little suggestion about these "horned" gobblins heavy infantry. I think they look a bit "strange" and lack in coherence with the faction in general. It is supposed the gobblins lack the technology and hability to make an elaborated armor; they have not a great and wise lider like Saruman or Sauron to "show" how to make it...
I think it could be more accurated a heavy infantry unit equipped with rusty pieces of armors and axes from darvens fall at Moria mixed with leather armor. May be an AOR unit call "Moria marauders" or something like that. They will be bodyguards too.
Nothing else. Fantastic work